JPS596144Y2 - self-excited generator rotor - Google Patents

Description

[Detailed description of the invention] The present invention is a self-excited power generator that includes a rotating shaft, a convex pole type field core that is stacked and fitted onto the rotating shaft, and a field coil that is wound around the core. This invention relates to the rotor of a generator, and in particular relates to the improvement of a rotor in which a ferrite magnet with the same polarity as the field core is attached to the field core in order to improve the rise of the initial output voltage of the generator. be.

Conventionally, this type of rotor has a convex pole type field core 2 as shown in FIG. 3A on a rotating shaft 1, as shown in FIGS. 1 to 3.
As shown in FIG.
Half-moon-shaped ferrite magnets 4A, 4 are attached to the convex pole parts 3A, 3B of
In order to prevent the magnets 4A and 4B from being separated and destroyed by the large centrifugal force during rotation of the rotor, a binding wire 5 was wound and fixed as shown in the figure. .

Therefore, this conventional rotor uses half-moon-shaped ferrite magnets 4
In order to fix A and 4B, it is necessary to prepare a large number of two types of field cores 2 and 3 punched out from soft iron plates using a press machine, as shown in Figure 3 A and 3. There is a drawback that the manufacturing cost is high, as two types of expensive punching dies are required, and the work of winding and fixing the half-moon-shaped ferrite magnets 4A and 4B with the binding wire 5 requires a field magnet as shown in the figure. Protector 7 for coils 6A and 6B
Because the process is performed by inserting as many as four pieces, it is extremely complicated, and is completely unsuitable for mass production processes using conveyors, for example, and has the drawback of significantly increasing manufacturing costs. Ta.

The purpose of this invention is to eliminate the above drawbacks.
One embodiment of the present invention, which has been particularly devised, will be described below as shown in the drawings.

Fig. 4 is a partially sectional side view of a rotor according to an embodiment of the present invention;
The figure is a sectional view taken along the line Y-Y in Figure 4, Figure 6 is a plan view of the field core used in the rotor, Figure 7 is a perspective view of the magnetic pole piece, and Figure 8 is the ferrite. 6 is a perspective view of a magnet and a non-magnetic plate. In the figure, 11 is a rotating shaft, 12 is a convex pole type field core fitted on the rotating shaft 11, and the single core 12 is as shown in FIG. A large number of coil winding parts 12A and 12B are stacked with slip rings 14.
Field coils 13A, 13B connected to the convex pole portion 12C are wound with ferrite magnets 15A, 15B which are magnetized in the radial direction in the concave groove 12D formed to penetrate in the axial direction. is inserted with non-magnetic plates 16 made of aluminum alloy or the like interposed on both sides thereof, and the magnetic pole portion 17A of the magnetic pole piece 17 is in contact with the outer periphery of the magnet 15.

A mounting portion 1 is shaped to support the axial side portion of the field core 12 at the axial end portion of the magnetic pole portion 17A.
At 7B, the field core 12 is fixed with a rivet 18.

In this case, the ferrite magnet 15A magnetized in the radial direction
, 15B has the disadvantage that it leaks to the iron core 12 via the attachment portion 17B of the pole piece 17.

However, since the amount of leakage magnetic flux increases or decreases almost in proportion to the thickness of the magnetic pole piece 17, by designing the thickness of the magnetic pole piece 17 to be as thin as possible in consideration of mechanical strength, which will be described later. The leakage magnetic flux can be reduced, but according to the inventors, the amount of leakage magnetic flux can be reduced to about 30% or less of the total magnetic flux, and most (about 70%)
Although it has been proven that the above) becomes effective magnetic flux, by interposing a non-magnetic plate (not shown) between the mounting portion 17B of the magnetic pole piece 17 and the field core 12, the leakage magnetic flux can be reduced. It is obvious without explanation that it can be made smaller.

Note that when inserting the ferrite magnets 15A, 15B and the non-magnetic plate 16 into the groove 12D of the field core 12, a suitable adhesive may be applied to the contact portions of these; If the non-magnetic plate 16 is inserted without being inserted, by caulking the portions indicated by arrows a1 and a2 in FIG.
It is firmly fixed to the magnetic pole piece 17.

Therefore, the ferrite magnet 15A fixed in this way
, 15B are magnetized in the radial direction so that the polarity is the same as that of the field core 12 generated when an excitation current flows through the field coils 13A, 13B. When rotated, this ferrite magnet 15A
, 15B can effectively raise an initial output voltage in a generator coil (not shown) wound around the stator of the generator.

Further, as described above, the outer periphery of the ferrite magnets 15A, 15B is covered with the magnetic pole part 17A of the magnetic pole piece 17, and the axial side part of the field core 12 is supported on the axial end of the magnetic pole part 17A. The field core 1 is attached to the mounting portion 17B shaped as
2, the ferrite magnets 15A and 15B, which are extremely hard and brittle, will not be separated and destroyed even if a large centrifugal force is applied during rotation of the rotor.

As is clear from the above description, according to the present invention, a concave groove is formed in the convex pole part of the field core, and a concave groove is formed through the convex pole part in the axial direction, and ferrite magnets magnetized in the radial direction are placed in this concave groove on both sides. A non-magnetic plate is inserted into the magnet, and the magnetic pole part of the magnetic pole piece is brought into contact with the outer periphery of the magnet, so that the magnetic pole piece supports the axial side part of the field core at the axial end of the magnetic pole piece. Since it is fixed to the field core using a mounting part shaped like this, it is not necessary to prepare two types of field cores by punching them out with a press machine in order to fix the ferrite magnet, as in the past. gone,
Since only one type of field core is required as shown in Figure 6, only one type of expensive punching die is required for the press machine, and the number of man-hours required for punching and lamination work can be greatly reduced. .

In addition, the conventional method of attaching a ferrite magnet in the shape of a half-moon to a field core, winding a binding wire around it, and fixing it is a cumbersome and cumbersome process that is completely unsuitable for mass production processes using conveyors, etc. Since it is unnecessary and suitable for mass production, the manufacturing cost can be significantly reduced.

Although the rotor of one embodiment of the present invention has been explained using a brush-equipped self-excited generator rotor equipped with a slip ring, the rotor of a so-called brushless self-excited generator that is not equipped with a slip ring is also described. There is no need to explain that the present invention can also be applied to this invention.

[Brief explanation of the drawing]

Fig. 1 is a partially cross-sectional side view of a conventional rotor of this kind, Fig. 2 is a sectional view taken along the line 4 is a partially sectional side view of a rotor according to an embodiment of the present invention; FIG. 5 is a sectional view taken along line Y-Y in FIG. 4; and FIG. FIG. 7 is a perspective view of a single magnetic pole piece, and FIG. 8 is a perspective view of the ferrite magnet and nonmagnetic plate. In the figure, 11 is a rotating shaft, 12 is a convex pole type field core, 12A
, 12B is a coil winding part, 12C is a convex pole part, 12D is a groove formed in the convex pole part 12C, 13A, 13B are field coils, 15A, 15B are ferrite magnets, 16 is a non-magnetic plate, 17 is a The magnetic pole piece, 17A is a magnetic pole part, and 17B is a mounting part.

Claims (1)

[Scope of utility model registration request] A rotor for a self-excited generator that has a rotating shaft, a convex-pole field core that is stacked and fitted onto the rotating shaft, and a field coil that is wound around the core. A ferrite magnet magnetized in the radial direction is inserted into a concave groove that passes through the convex pole part in the axial direction, with non-magnetic plates interposed on both sides, and the magnetic pole part of the magnetic pole piece is brought into contact with the outer periphery of this magnet. A rotor for a self-excited generator, characterized in that a mounting portion formed by bending both axial ends of a single magnetic pole portion in the radial direction is fixed to the axial side portion of the field core by contacting the same.